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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bb0e42f24b34e76e5c689e5ba0558d2bc89c048e5f0d7893b096aaf90c2bb6' 
  AND token = 'a5pXyApBUMI7/Dg8q5Q8JawhgXblKKXJ+J07yzItXCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}